BRAKE LIGHTS STAY ON ENGINE RUNNING BUT CAR WONT DRIVE

More than likely the stater motor is knackered,but if it's a manual drive you should be able to push start,in second gear.

check alternator drive belt for tension and condition
have the charge system checked including the voltage regulator
indications are that at some point the car was running on the battery only

Make sure the fluid level is ok. If it is could need an overhaul stretched bands Hope its simple as fluid

this is a feature, on A/T cars. for vast years, !!!
my jeep is M/T and has no such thing, but A/T has this.
This feature, prevents starting in GEAR.
called park lock out, so the Audi lady can't drive over her kids, ( really sad huh?)

Called BTSI: by jeep.
this feature does, not stop starts/crankikng. unless, the shifter is not placed
in park or neutral. (this feature blocks cranking in any gear)

so i must guess, its in park, engine is running, right?
and your foot, is on the brake, and the brake lights do glow behind car, if not the park lock will stay locked.

if you need a schematic, i can send it.
some cars there is a park lock out bypass so you can drive
with no brake lights. (LOL)

the BTSI bypass is missing this feature, in 2006, unlike older cars.
a federal mandate that bypass removal.

check the brake light fuses first of brake lights are dead.
the post back for schematic.
the FSM covers how to fix this on all cars made, (usa car, and forum)
The OEM "factory service manual" buy one and end guessing.
or login to alldata.com


http://www.scantool.net/software/alldata-diy-1-month-subscription.html

so does the starter work or not in park or neutral.
this i can not guess from your post. at all.

no starts
no cranks
fails to stay running, engine.
what?
if the key will not crank the engine in park , then try cranking
in Neutral,(this trick uses fresh PRNDL contacts)
if the engine will not crank use jumper cable ump starts from a running donor car, (read paper sheet in cable box, it tells how )

if the car now cranks and starts jumped,that means the battery
was (is) discharged, that can be caused by phantom drains.
all tests are easy, and all take only a 10$ walfart DMM meter.
to find true cause , ask.

try posting what step fails in the operator guide , how to start your engine.
shift to park.
foot on brake,
turn key to crank, does this fail?

stationary rpm is to low,its normal higher the handgearbox.
too keep motor running it chould be higher so engine stay running,
while put in drive.

I dont know much about audi, but on most domestic ford chevy etc. theres a braklight switch under the dashboard tat actually controls the brake lights, its vary possible that it may be defective.

If all the brake lights stay on then the brake light switch is the first thing to check. It cod also be dagger wiring to the switch or it may just be loose and/or out of place.

Sometimes the issue is with the mechanical vacuum pump off to the side of the ABS/ESP module. It looks like a round silver canister. This issue is all over Google with many possibilities but the one I copied is most common.

have you checked the brake lights for operation ?
if they don't work than it is your brake light switch located on the pedal support bracket.

Known problem with gearbox control units. High failure rate. Gearbox lights flahing. May not select reverse gear. Take to dealer as may get some goodwill on this.